insidious

perfidious, treacherous

beguiling, deceitful, deceiving, deceptive, deluding, delusive, delusory, fallacious, false, misleading, specious

artful, crafty, cunning, devious, foxy, guileful, shady, shifty, slick, sly, sneaking, sneaky, subtile, subtle, trick, trickish, tricky, underhand, underhanded, wily

inaccurate, incorrect, wrong

bewildering, confounding, distracting, perplexing, puzzling

ambidextrous, crooked, defrauding, dishonest, dissembling, double-dealing, duplicitous, faithless, fast, fraudulent, knavish, lying, mendacious, untrustworthy, untruthful

bogus, counterfeit, fake, feigned, forged, jive [slang], phony (also phoney), sham, spurious

ambiguous, circuitous, equivocal, evasive

artificial, backhanded, hypocritical, insincere, left-handed, two-faced